diff --git a/localization/localization_error_monitor/config/localization_error_monitor.param.yaml b/localization/localization_error_monitor/config/localization_error_monitor.param.yaml
index 026daf0532d33..b4f66e7e4659e 100644
--- a/localization/localization_error_monitor/config/localization_error_monitor.param.yaml
+++ b/localization/localization_error_monitor/config/localization_error_monitor.param.yaml
@@ -1,7 +1,7 @@
 /**:
   ros__parameters:
     scale: 3.0
-    error_ellipse_size: 1.0
-    warn_ellipse_size: 0.8
+    error_ellipse_size: 1.5
+    warn_ellipse_size: 1.2
     error_ellipse_size_lateral_direction: 0.3
     warn_ellipse_size_lateral_direction: 0.2